swftextfield() creates a new text field object.
Text Fields are less flexible than swftext() objects-
they can't be rotated, scaled non-proportionally, or skewed, but they can
be used as form entries, and they can use browser-defined fonts.

The optional flags change the text field's behavior. It has the following
possibles values :

SWFTEXTFIELD_DRAWBOX draws the outline of the textfield

SWFTEXTFIELD_HASLENGTH

SWFTEXTFIELD_HTML allows text markup using HTML-tags

SWFTEXTFIELD_MULTILINE allows multiple lines

SWFTEXTFIELD_NOEDIT indicates that the field shouldn't be user-editable